Chordate

Chordates (phylum Chordata) include                 Chordates
the vertebrates, together with              Scientific classification
several closely related
invertebrates. They are united by    Kingdom: Animalia
having, at some stage in their life, Phylum:  Chordata
a hollow dorsal nerve cord (the
notochord), pharyngeal slits, a tail             Typical classes
extending past the anus, and bands   Subphylum Urochordata (sea squirts)
of muscles that go around the body.  ΚΚΚ Ascidiacea
                                     ΚΚΚ Thaliacea
The traditional classification of    ΚΚΚ Larvacea
vertebrates contains a wide variety  Subphylum Cephalochordata (lancelets)
of paraphyletic groups, which in     Subphylum Myxini (hagfish)
newer systems may either be          Subphylum Vertebrata (vertebrates)
abandoned or greatly extended. No    ΚΚΚ Petromyzontida (lampreys)
particular standard system has       ΚΚΚ Placodermi - extinct
developed yet, and the groups given  ΚΚΚ Chondrichthyes (cartilaginous fish)
at right should be considered        ΚΚΚ Acanthodii - extinct
tentative.                           ΚΚΚ Actinopterygii (ray-finned fish)
                                     ΚΚΚ Actinistia (coelacanths)
Other groups that have been used (in ΚΚΚ Dipnoi (lungfish)
alphabetical order):                 ΚΚΚ Amphibia (amphibians)
                                     ΚΚΚ Reptilia (reptiles)
   * Agnatha - jawless vertebrates   ΚΚΚ Aves (birds)
   * Amniota - reptiles, birds,      ΚΚΚ Mammalia (mammals)
     mammals
   * Anapsida - turtles
   * Archosauria - crocodiles, birds, dinosaurs, etc.
   * Craniata - vertebrates and hagfish
   * Diapsida - lepidosaurs and archosaurs
   * Dinosauria - dinosaurs, sometimes including birds
   * Gnathostomata - jawed vertebrates
   * Lepidosauria - lizards and snakes
   * Lissamphibia - core amphibians
   * Osteichthyes - bony fish, consisting of ray-finned fish and lobe-finned
     fish, sometimes includes all Tetrapoda
   * Sarcopterygii - lobe-finned fish, consisting of coelacanths and
     lungfish, sometimes includes all Tetrapoda
   * Synapsida - mammals and extinct relatives
   * Tetrapoda - four-limbed vertebrates

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